<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <!-- 1. 准备容器 -->
  <div id='app'>
    <!-- 4. 渲染数据 -->
    <button @click="fn">切换显示隐藏</button>
    <button @click="() => isShow = !isShow">切换显示隐藏</button>
    <h1 v-show="isShow">黑马程序员</h1>
  </div>
  <!-- 2. 引入vuejs -->
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    // 3. 创建Vue实例
    const app = new Vue({
      el: '#app',
      data: {
        isShow: true
      },
     methods : {
      fn () {
        this.isShow = !this.isShow
      }
     }
    })
  </script>
</body>

</html>